Crosby, an author and writer whose grandmother was killed by encephalitis lethargica, or "sleeping sickness," examines the mysterious epidemic which killed about one million people around the world in the 1920s, mostly in New York City.

The doctors had diagnosed encephalitis lethargica, popularly but inaccurately called ``sleeping illness'', the terrible condition which spread through North America and Europe with the Spanish influenza pandemic which killed 50 million people after World War One .

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